Labour says there are rumblings within the National party over who will succeed John Key as leader.
West Coast MP Damien O'Connor says front benchers Judith Collins and Steven Joyce are both jostling behind the scenes for a shot at the top job.
He says a leadership change may come before the next election.
"There's quite a bit in the National Party just below the surface. There are a couple of people lining up there and Collins is one of them of course and Mr Joyce. We'll see what comes of that over the next year or so."
Mr O'Connor says unlike Labour, National is good at keeping their internal problems quiet.
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